IEC TR 63363-1:2022

Performance of voltage sourced converter (VSC) based high-voltage direct current (HVDC) transmission - Part 1: Steady-state conditions

IEC TR 63363-1:2022(E) is to present the "state of the art" with respect to general guidance on the steady-state performance demands of VSC HVDC transmission systems. It concerns the steady-state performance of two-terminal VSC HVDC transmission systems utilizing converters with power flow capability in both directions.
Different configurations of a VSC HVDC transmission system are covered in this document, including the symmetrical monopolar, asymmetrical monopolar, bipolar with earth return, bipolar with dedicated metallic return and rigid bipolar configurations.
There are many variations between different VSC HVDC transmission systems. This document does not consider these in detail; consequently, it cannot be used directly as a specification for a particular project, but rather to provide the general basis for the system steady-state performance demands.
Normally, the performance specifications are based on a complete system including two VSC HVDC converter stations. However, sometimes a VSC HVDC transmission system can also be separately specified and purchased from multiple vendors instead of single turnkey vendor. In such cases, due consideration can be given to the coordination of each part with the overall VSC HVDC system performance objectives and the interface of each with the system can be clearly defined. The major components of the VSC HVDC transmission system are presented in IEC 62747.
Referring to IEC 62747, an HVDC substation/converter station is defined as that part of the VSC HVDC transmission system which consists of one or more VSC converter units installed in a single location together with buildings, reactors, filters, reactive power supply, control, monitoring, protective, measuring and auxiliary equipment. The AC substations are not covered in this document.
This document provides guidance and supporting information on the procedure for system design and the technical issues involved in the system design of VSC HVDC transmission projects for both owners and contractors. This document can be used as the basis for drafting a procurement specification and as a guide during project implementation.

General Information

• Status: Published
• Publication Date: 29-May-2022
• ICS: 29.200 - Rectifiers. Convertors. Stabilized power supply
• ICS: 29.240.01 - Power transmission and distribution networks in general
• Technical Committee: TC 115 - High Voltage Direct Current (HVDC) transmission for DC voltages above 100 kV
• Drafting Committee: JWG 11 - TC 115/JWG 11
• Current Stage: PPUB - Publication issued
• Start Date: 30-Jun-2022
• Completion Date: 30-May-2022

Standards Content (Sample)

IEC TR 63363-1 ®
Edition 1.0 2022-05
TECHNICAL
REPORT
colour
inside
Performance of voltage sourced converter (VSC) based high-voltage direct
current (HVDC) transmission –
Part 1: Steady-state conditions
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IEC TR 63363-1 ®
Edition 1.0 2022-05
TECHNICAL
REPORT
colour
inside
Performance of voltage sourced converter (VSC) based high-voltage direct

current (HVDC) transmission –
Part 1: Steady-state conditions

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.200; 29.240.01 ISBN 978-2-8322-2198-3

– 2 – IEC TR 63363-1:2022  IEC 2022
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms, definitions and abbreviated terms . 10
3.1 Terms and definitions . 10
3.2 Abbreviated terms . 11
4 Classifications of VSC HVDC systems . 12
4.1 General . 12
4.2 Symmetrical monopolar HVDC system . 12
4.3 Asymmetrical monopolar HVDC system . 13
4.3.1 General . 13
4.3.2 ASMP with earth return . 13
4.3.3 ASMP with metallic return . 13
4.4 Bipolar HVDC system . 14
4.4.1 General . 14
4.4.2 Bipolar HVDC with earth return . 14
4.4.3 Rigid bipolar configuration . 14
4.4.4 Bipolar HVDC with dedicated metallic return . 15
4.5 Back-to-back HVDC system . 15
4.6 Interface transformer arrangements . 15
4.7 Switching and reconfiguration . 16
4.7.1 Converter station and DC yard switching . 16
4.7.2 Transition station switching . 17
4.7.3 Connecting multiple converters . 18
4.7.4 DC gas-insulated metal enclosed switchgear (DC GIS) . 22
5 Environmental information . 22
6 Rated power, current and voltage . 24
6.1 Rated power . 24
6.2 Rated DC current . 24
6.3 Rated DC voltage . 25
7 Steady-state operation . 25
7.1 General . 25
7.2 PQ diagram. 25
7.3 UQ diagram . 26
7.4 Reactive power exchange . 27
8 Overload and equipment capability . 28
8.1 Overload . 28
8.2 Equipment capability . 28
8.2.1 General . 28
8.2.2 Converter valve capability . 29
8.2.3 Capability of oil-cooled transformers and dry type reactors . 29
8.2.4 Capability of other converter station equipment . 29
9 Converter station types and operation modes . 29
9.1 Converter station types . 29
9.2 Operation modes . 31

9.2.1 Reduced direct voltage operation . 31
9.2.2 Full direct voltage operation . 31
9.2.3 Operating sequences . 31
10 AC system . 33
10.1 General . 33
10.2 AC voltage . 34
10.2.1 Steady-state voltage range . 34
10.2.2 Negative sequence voltage . 34
10.3 Frequency . 34
10.3.1 Rated frequency . 34
10.3.2 Steady-state frequency range . 34
10.3.3 Short-term frequency variation . 34
10.3.4 Frequency variation during emergency . 35
10.4 AC voltage and frequency operation ranges . 35
10.5 System impedance . 35
10.6 Positive and zero-sequence surge impedance. 36
10.7 Other sources of harmonics . 36
11 Reactive power . 36
11.1 General . 36
11.2 VSC HVDC systems . 36
12 HVDC transmission line, earth electrode line and earth electrode . 37
12.1 General . 37
12.2 Overhead line(s) . 37
12.2.1 General . 37
12.2.2 Electrical parameters . 37
12.3 Cable(s) . 38
12.3.1 General . 38
12.3.2 Electrical parameters . 38
12.4 Transmission line combined with overhead line and cable section . 39
12.5 Electrode line . 39
12.6 Earth electrode . 39
12.7 Gas insulated line . 39
13 Reliability . 39
14 HVDC control . 39
14.1 General . 39
14.2 Control objectives . 40
14.3 Control structure . 40
14.3.1 General . 40
14.3.2 HVDC bipole/station control . 41
14.3.3 HVDC pole control . 42
14.3.4 Converter and valve control . 43
14.4 Measurement . 43
15 Telecommunication . 44
15.1 Types of telecommunication links . 44
15.2 Classification of data to be shared . 44
15.3 Fast response telecommunication . 44
16 Auxiliary systems . 45
16.1 General . 45

– 4 – IEC TR 63363-1:2022
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